Nora is a diminutive wanderer who travels between homes offering assistance to the families living within them, seeking shelter in exchange for her help. When she arrives at a modest house to find its full-sized owner, Lidia, struggling to pay rent after her husband's death, Nora discovers that the tiny family inhabiting the walls—a young girl named Aiko caring for her ailing mother—faces their own crisis of displacement. To save both households from ruin, Nora must navigate the towering domestic spaces undetected, avoiding Lidia and her watchful cat while gathering materials to enhance her abilities and solve the problems plaguing each family. Armed with tools like smoke bombs and eventually more sophisticated equipment such as a glider and grappling hook, she must rely on stealth and platforming skill to accomplish her mission across three dangerous levels without being spotted.